94242721 has 4 divisors (see below), whose sum is σ = 97492500. Its totient is φ = 90992944.

The previous prime is 94242703. The next prime is 94242749. The reversal of 94242721 is 12724249.

94242721 = 6864² + 6865².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47128225 + 47114496 = 6865^2 + 6864^2 .

It is a cyclic number.

It is not a de Polignac number, because 94242721 - 2¹⁵ = 94209953 is a prime.

It is a super-2 number, since 2×94242721² = 17763380922967682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (94242121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624846 + ... + 1624903.

It is an arithmetic number, because the mean of its divisors is an integer number (24373125).

Almost surely, 2^94242721 is an apocalyptic number.

94242721 is the 6865-th centered square number.

It is an amenable number.

94242721 is a deficient number, since it is larger than the sum of its proper divisors (3249779).

94242721 is a wasteful number, since it uses less digits than its factorization.

94242721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249778.

The product of its digits is 8064, while the sum is 31.

The square root of 94242721 is about 9707.8690246624. The cubic root of 94242721 is about 455.0746099925.

The spelling of 94242721 in words is "ninety-four million, two hundred forty-two thousand, seven hundred twenty-one".